Hydrogenated Butylene/Ethylene/Styrene Copolymer
AKA “Hydrogenated Polymer, Styrenic Copolymer
Synthetic
Ingredient Facts
Hydrogenated butylene/ethylene/styrene copolymer
AKA: Hydrogenated Polymer, Styrenic Copolymer
Synthetic · Emollient · EWG: 4
Synthetic
Emollient
Skin Conditioner
Synthetic
Clean
Ethenylbenzene, polymer with butene and ethene, hydrogenated Science: Process: Catalytic Hydrogenation | Functions: Skin Conditioning, Skin Conditioning - Emollient, Viscosity Controlling Safety Ratings: CIR: Safe as used
Form
Liquid
State
Solid
See origin →
Functions
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Viscosity Controlling
Locks In Moisture
Traditional Use
A modern synthetic copolymer created for cosmetics in the late 20th century. Used as a thickener, texturizer, and film-former in skincare and makeup products.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR